Circuit Description
The torque converter clutch (TCC) normally closed cruise brake switch supplies a B+ signal on the brake switch input circuit to the powertrain control module (PCM). The circuit is opened when the brakes are applied. The stoplamp/cruise control normally open brake switch supplies a B+ signal on the stoplamp switch input circuit to the PCM when the brake is applied.
Conditions for Running the DTC
The ignition is in the ON position.
Conditions for Setting the DTC
| • | The switches disagree for 10 consecutive minutes. |
| or |
| • | The TCC and the cruise control brake switches are not toggling open and closed, during 6 brake applications on the same ignition cycle. |
Action Taken When the DTC Sets
| • | The PCM will not illuminate the malfunction indicator lamp (MIL). |
| • | The PCM records the operating conditions at the time the diagnostic fails. This information is stored in the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | A history DTC clears after 40 consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures. |
| • | The scan tool Clear Info function was used. |
Diagnostic Aids
Check the driving habits of the customer and/or unusual traffic conditions, for example, stop and go, and expressway traffic.
An open fuse on the stoplamp circuit may be caused by a short to ground on the feed or signal side of the stoplamp switch.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 |
Important: Before clearing the DTCs, use the scan tool Capture Info to save the Freeze Frame and Failure Records for reference. The data in the control module is deleted once the Clear Info function is used. Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- | ||
2 |
Does the scan tool display the cruise brake switch Closed and then Open when the brake is applied? | -- | ||
3 | Apply the brakes again. Does the scan tool display the stoplamp switch Open and then Closed when the brake is applied? | -- | ||
Is the test lamp ON? | -- | |||
5 |
Is the test lamp ON? | -- | ||
Does the scan tool display the brake switch Closed? | -- | |||
7 |
Is the test lamp ON? | -- | ||
8 |
Does the scan tool display the Cruise Brake Switch Closed? | -- | ||
9 | The DTC is intermittent. If no additional DTCs are stored, refer to Diagnostic Aids. If additional DTCs are stored, refer to the applicable DTC tables first. Are any additional DTCs stored? | -- | Go to the applicable DTC table | Go to Diagnostic Aids |
10 | Check the feed circuit for an open or short to ground. Repair the circuit as necessary. Refer to Wiring Repairs in Wiring Systems. Did you perform a repair? | -- | ||
11 |
Did you perform a repair? | -- | ||
12 | Check the stoplamp switch signal circuit for an open or a short to ground. Repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you perform a repair? | -- | ||
13 | Check the stoplamp switch signal circuit for a proper connection at PCM. Repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you perform a repair? | -- | ||
14 | Check the feed circuit for an open or short to ground. Repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you perform a repair? | -- | ||
15 | Check the cruise brake switch signal circuit for an open or short to ground. Repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you perform a repair? | -- | ||
16 | Check the cruise brake switch signal circuit for a proper connection at PCM. . Repair as necessary. Refer to Wiring Repairs in Wiring Systems. Did you perform a repair? | -- | ||
17 | Replace the TCC stoplamp switch. Refer to Stop Lamp Switch Replacement . Is the action complete? | -- | -- | |
18 |
Important: The new PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | |
19 |
Does the scan tool indicate the diagnostic Passed? | -- | ||
20 | Does the scan tool display any additional undiagnosed DTCs? | -- | Go to the applicable DTC table | System OK |
